main{
    padding: 100px 30px;
}
nav div{
    text-indent: 50px;
    line-height: 70px;
}
a:link,a:visited{color:#444;text-decoration:none;}
a:hover{color:#42b983;}
.clickbtn{
    border-bottom: 2px solid #42b983;
}
h4{
    text-align: center;
    margin: 100px 0 50px;
}
.title{
    font-weight:600;
    border-bottom: 1px solid #ddd;
    padding-bottom: 40px;
    margin: 35px 0;
    font-size: 40px;
}
b{
    margin: 10px 0;
}
#desc1,#desc2,#desc3,#desc4{
    margin: 20px 0;
}
ul{
    font-size: 30px;
}